Enter the bill total, a tip percentage and the number of people, and the result shows the tip amount, the grand total and each person's share.
The tip is calculated on the total you enter, the two are added, and the result is divided by the number of people. Everything rests on which total you started from, and that is where bills go wrong: tipping on a figure that already includes tax means tipping on the tax, and tipping on a total that already includes a service charge means paying twice for the same thing. The split is even by definition, and each share is rounded to two decimal places, so on some bills the shares total a cent or two away from the grand total.
Before you split the bill
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Check for a service charge first:
many restaurants add ten to fifteen per cent automatically, particularly for larger groups. Tipping on top of it is optional and often unintended.
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Decide whether to tip on the pre-tax figure:
tipping on the gross total means tipping on tax as well, which adds a little to the bill and is entirely a matter of preference.
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Conventions differ by country:
twenty per cent is a norm in the United States, ten per cent or rounding up is common across much of Europe, and in Japan tipping can cause offence.
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An even split is not always a fair one:
if one person had a set menu and another a single coffee, dividing equally is a social decision rather than an arithmetic one.
Everything depends on which total you actually start from
The [msm_tool slug="tip-calculator"] calculates the tip on whatever total is entered, adds the two together, and divides the result by the number of people — simple arithmetic that goes wrong entirely at the input stage rather than in the calculation itself. Tipping on a figure that already includes tax means tipping on the tax as well, and tipping on a total that already includes a service charge means effectively paying for the same thing twice.
Check for a service charge before adding anything
Many restaurants add ten to fifteen per cent automatically, particularly for larger groups, and it is easy to miss on a bill that is not read closely. Tipping on top of a charge that already covers service is optional rather than expected, and often happens simply because nobody noticed it was already there.
Pre-tax or post-tax is a preference, not a rule
Tipping on the pre-tax figure is the stricter reading, since tax was never part of the service being rewarded, while tipping on the full total is simpler and costs a little more. Neither is wrong; it is a genuine choice rather than a calculation with one correct answer.
Conventions vary enormously by country
Around twenty per cent is standard in the United States, ten per cent or simply rounding up is common across much of Europe, and in Japan offering a tip can cause offence rather than being appreciated. Local custom decides what is appropriate far more than any formula does.
Why individual shares can land a cent or two off the total
Each person's share is rounded to two decimal places independently, and several roundings applied separately can leave the sum a small amount away from the actual grand total — not an error in the calculation, just what rounding several numbers does when they are added back together afterwards.
An even split is not always the fair one
Dividing a bill equally is straightforward arithmetic, but where one person ordered a full meal and another had a single coffee, an equal split becomes a social decision about the group rather than a neutral calculation — worth agreeing on deliberately rather than defaulting to without discussion.